Although he is currently an actor himself on the HBO series Ballers, he will probably never be as good of an actor as his father, Denzel Washington.

Fairly decent player, but his dad Antonio Fargas' claim to fame was playing Huggy Bear in the original Starsky & Hutch tv show.

Heath's cousin is actor and singer Drake Bell of the famous Nickelodeon tv show Drake & Josh.

Maybe famous isn't the best word to describe some on this list, but Matt's brother, Jonny Diaz, is a fairly well-known Christian singer.

Very wild pitcher due to his poor vision, but his nephew has gained fame under the name Blackie Lawless, the lead singer of the Metal band W.A.S.P.

Conor's father was tv actor John M. Jackson of JAG and NCIS: Los Angeles fame.

This is a really bizarre one because Kershaw is definitely more famous then his great-uncle, Clyde Tombaugh, however Clyde made a fairly important discovery, Pluto! That's right, The main who discovered Pluto has a great-nephew who has won 3 Cy Young Awards!

Usually on list for funniest athlete names, but this time he's on this list because his father, Peter Marshall, was the host of Hollywood Squares and his aunt is actress Joanne Dru.

Mack's grandson, Connie Mack III was a member of the US House of Representatives and the US Senate, and his great-grandson, Connie Mack IV was a never of the US House of Representatives too.

Way more famous than his nephew, Kelly Mantle, but it is funny to think one of the better baseball players of all-time has a nephew who is a drag-queen.